Corporal/ˈkɔːrpərəl/ Definition 1 of 3Pro Tip 1/3Military Rank Corporal is a specific rank, so use it only when talking about military positions. He just got promoted to corporal last week. Pro Tip 2/3Hierarchy Context Corporal is used in hierarchical systems, often indicating authority or responsibility. As a corporal, she has to lead her squad. Pro Tip 3/3Not Basic Training It's incorrect to call new recruits corporals; the title is earned with experience. After two years, he advanced from private to corporal.